Agreement contingent on impossible events void.— Contingent agreements to do or not to do anything, if an impossible event happens, are void, whether the impossibility of the event is known or not to the parties… 

Obligation of parties to contracts.— The parties to a contract must either perform, or offer to perform, their respective promises, unless such performance is dispensed with or excused under the provisions of this Act, or… 

Effect of refusal to accept offer of performance.— Where a promisor has made an offer of performance to the promisee, and the offer has not been accepted, the promisor is not responsible for non-performance, nor… 

Effect of refusal of party to perform promise wholly.— When a party to a contract has refused to perform, or disabled himself from performing, his promise in its entirety, the promisee may put an end… 

Person by whom promise is to be performed.— If it appears from the nature of the case that it was the intention of the parties to any contract that any promise contained in it should… 

Effect of accepting performance from third person.— When a promisee accepts performance of the promise from a third person, he cannot afterwards enforce it against the promisor.

Devolution of joint liabilities.— When two or more persons have made a joint promise, then, unless a contrary intention appears by the contract, all such persons, during their joint lives, and, after the death of… 

Any one of joint promisors may be compelled to perform.— When two or more persons make a joint promise, the promisee may, in the absence of express agreement to the contrary, compel any one or… 

Effect of release of one joint promisor.— Where two or more persons have made a joint promise, a release of one of such joint promisors by the promisee does not discharge the other joint promisor…